English: tar spot; tar spot of maize; Spanish: mancha de asfalto; mancha negra; mancha negra del maiz; French: tache noire du mais. El “complejo mancha de asfalto” del maíz, su distribución geográfica, requisitos Etiología y manejo de la mancha de asfalto (Phyllachora maydis Maubl.). mancha de asfalto del maiz . Malaguti, G. Subero, L.J.. Access the full text: NOT AVAILABLE. Lookup the document at: google-logo. mancha de asfalto del.
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Known primarily from the cooler and higher elevations Malaguti and Subero, ; Bajet et al. Initial symptoms are small, yellow-brown spots on either side of the leaf.
The accuracy of the tests was estimated with the coefficient of determination r 2 of the same linear regression and with the absolute deviation of the error. The value of the b 0 intercept was positive in almost all cases, which indicates that there is a tendency to overestimate the severity of the disease; this tendency was greater for the evaluators without experience.
High levels of accuracy were mais r 2 was comprised between the range of 0. Ascospores of Phyllachora spp. Generate a print friendly version containing only the sections you need.
Tropical and subtropical maize cropping patterns may allow the pathogen to persist and multiply. Measures to reduce the initial inoculum for a new crop would depend on the source of that inoculum and cultivation practices.
Not known to be seedborne or to infect other species, P.
Arrasa la “Mancha de Asfalto” con siembra de maíz | El Veraz
Clypeus amphigenous, developing in epidermis, generally circular, 0. To cause the serious damage that occurs in the native range, the two fungi would need to be introduced together in order to threaten the crop, unless M. Invasion of the host and development of the fungus.
This was due to the complicated quantification system and to the elevated number of classes with which it was developed; furthermore, it considered the symptoms caused by both infectious agents separately. Transport of ears in the husk or of items made with leaves or husks are possible means of introduction. One or more of the features that are needed to show you the maps functionality are not available in the web browser that you are using.
Fenpropimorph one or two treatments and mancozeb applied every 10 days were found to be the most effective fungicides in field plot tests in Mexico Bajet et al. Incidence of tar spot disease of corn in Puerto Rico. The anamorphic form of Monographella maydis usually grows in the necrotic areas around the ascomata Muller and Samuels, ; Bajet et al.
Phyllachora species are generally obligate parasites, and cannot be cultured on the usual laboratory media Parbery, b. No species of Phyllachora are reported as seedborne Richardson, Its incidence on P.
The overestimation of assfalto severity levels using logarithmic scales has been common in several pathosystem. Distribution Maps Top of page You can pan and zoom the map.
Revista mexicana de fitopatología
Elsewhere, removal of volunteer plants or wild maize relatives may be appropriate. In lowland eastern Mexico, when only P. The relationship of certain scolecospores to species of Phyllachora. ProMED-mail 20 April Accidental Introduction This has not been reported, but the natural means of dispersal may not be sufficient to explain spread between mncha favourable areas of maize cultivation at higher elevations in South America or to islands in the Caribbean.
Orton distinguished P. This has been demonstrated for other pathosystems: The source of initial inoculum for both fungi is not determined. Biological Control Reduction in size of P. Foliar fungal diseases http: The clypeus stroma of Phyllachora species grows separately in the epidermis on either side of the leaf and is not an extension of the perithecia Parbery, b.
The precision reproducibility or variation associated with an estimationestimated by the coefficient of determination r 2 and by the variability of the absolute errors Nutter et al. Title Symptoms Caption ‘Fisheye’ spots developed around tarspots on Zea mays.
Parbery a suggested rain splash as a dispersing agent for Phyllachora on grasses in Australia. Physiology and Phenology Phyllachora species are generally obligate parasites, and cannot be cultured on the manha laboratory media Parbery, b. Bulletin de la Societe Mycologique de France, Especes nouvelles de champignons inferieurs. The pycnidia mziz the Linachora asexual state appear early in infection Parbery, ; Aefalto et al. Given the increasing importance of the Tar Spot Complex, standardized methods for the quantification of the disease are required, methods that allow the conduction of accurate, precise, and reproducible epidemiological studies; understanding ‘accuracy’ as the proximity that an estimated value has to the real value, ‘precision’ as the variation or repeatability associated with an estimation, and ‘reproducibility’ as the absence of change in the estimations when several evaluators quantify the same characteristics Nascimiento et al.
Phyllachora maydis (black spot of maize)
The International Seed-Testing Association. Where maize [ Zea mays ] is grown continuously in the vicinity, efforts at sanitation are not likely to be effective. Mamcha of Corn Diseases [ed.